Debt (Schedule of Debt) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt and stated interest rates
Repayments of Long-term Debt	$ 2	$ 753
Stated interest rate long-term debt (as a percent)
Ameriprise Financial [Member]
Debt and stated interest rates
Long-term debt	2,834		$ 2,831
Finance lease liabilities	46		44
Other	(12)		(13)
Total long-term debt	2,834		2,831
Short-term borrowings	200		200
Total	3,034		3,031
Ameriprise Financial [Member] \| Federal Home Loan Bank [Member]
Debt and stated interest rates
Short-term borrowings	$ 200		$ 200
Stated interest rate (as a percent) short-term debt	0.30%		0.40%
Ameriprise Financial [Member] \| Federal Home Loan Bank [Member] \| Maximum [Member]
Debt and stated interest rates
Remaining maturity of outstanding amount of short term borrowings	2 months		2 months
Ameriprise Financial [Member] \| Federal Home Loan Bank [Member] \| Commercial mortgage backed securities [Member]
Debt and stated interest rates
Securities pledged as collateral	$ 1,200		$ 1,300
Ameriprise Financial [Member] \| Federal Home Loan Bank [Member] \| Residential mortgage backed securities [Member]
Debt and stated interest rates
Securities pledged as collateral	535		604
Ameriprise Financial [Member] \| Senior notes due 2022 [Member]
Debt and stated interest rates
Long-term debt	$ 500		$ 500
Stated interest rate long-term debt (as a percent)	3.00%		3.00%
Ameriprise Financial [Member] \| Senior notes due 2023 [Member]
Debt and stated interest rates
Long-term debt	$ 750		$ 750
Stated interest rate long-term debt (as a percent)	4.00%		4.00%
Ameriprise Financial [Member] \| Senior notes due 2024 [Member]
Debt and stated interest rates
Long-term debt	$ 550		$ 550
Stated interest rate long-term debt (as a percent)	3.70%		3.70%
Ameriprise Financial [Member] \| Senior Notes 2025
Debt and stated interest rates
Long-term debt	$ 500		$ 500
Stated interest rate long-term debt (as a percent)	3.00%		3.00%
Ameriprise Financial [Member] \| Senior notes due 2026 [Member]
Debt and stated interest rates
Long-term debt	$ 500		$ 500
Stated interest rate long-term debt (as a percent)	2.90%		2.90%

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